Best drive setup?

Hey Adobe Community.

I am not sure, how my drive setup for Premiere should be.

My drives are: 
500gb Nvme M.2 Samsung

250gb SSD Samsung

1tb SSHD (old drive for backup)

1tb basic HDD (also backup)

I am running OS and program on the m.2 with lots of free space.

Media cache and scrach files are on my 250gb ssd, and backups are on the 2 1tb drives

My doubt is, where i should keep my current project and media, on my m.2 or my normal SSD. As mentioned earlier, space is not an issue in both drives, therefore I just want the fastest outcome.

Thanks for your time!